<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>@keyframes</title>
    <style>
     /* 动画定义运动轨迹 - 过渡 + 关键帧 + steps函数 */
    </style>
</head>

<body>
    <div class="box"></div>
</body>

</html>